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Scratch detection


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#1 Vincent Sweeney

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Posted 20 December 2007 - 04:33 AM

I have a very fine scratch on some test shots I did recently. It is hard to see and it isn't in every frame from the telecine, but is in most of them. It runs from the top to the bottom of the frame and doesn't seem to shift too much laterally.

Can anyone describe how they start looking for sources? This is from an LTR54. The scratch is about mid way left of center frame. The other mag didn't show any problems.
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#2 Kenny N Suleimanagich

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Posted 25 December 2007 - 04:00 AM

Was your gate clean? I've learned sometimes a dirty gate (or even area surrounding the gate) can be the cause of scratches. Also, did you blow out your mags with air? Dust or emulsion buildups can scratch film, that happend on a shoot I operated on with an SR3
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#3 Adrian Sierkowski

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Posted 25 December 2007 - 10:58 PM

Also if you didn't properly form your loop you'll have a white scratch through frames. I had that happens on my SR3 on a shoot where the film was chugging along a bit on the bottom of the loop right before the take-up.
If you have a screen capture it might be easier to diagnose. I posted one and got a solid answer of the cause in about 45 minutes.
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#4 Vincent Sweeney

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Posted 26 December 2007 - 01:31 AM

Kenny, yes and yes. The cleanest 54 on earth, as is any camera that I am to shoot with. Good reminder though to anyone who doesn't understand how important it is to have a spotless mag, tent and camera.

Adrian, thanks for the idea but the loop was pretty tight.

I'll post a frame after I get the newest transfer back on hard drive this week. Though it's possible that they'll be gone as it looks like it will get treated to a Teranex/Scratchout session now. If so I'll try to post from the other transfer.
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#5 Vincent Sweeney

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Posted 31 December 2007 - 04:51 PM

The scratch is gone now. Not sure if I can post the old transfer.
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